chore: run tox w/o sdist

[jkowalleck]

our sdist config ships tests and docs.

when you have a lot of venvs laying around in the tests or docs flder, then poetry build -f sdist crashes ... a known bug of poetry ...

per default, tox installs in sdist mode .... this causes issues locally, ... which is annoying.

here is a workaround: dont build sdist, build wheel only.

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -1.00%)	:white_check_mark: ∅ (target: 80.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (0feede26b86cffbcc4c293ffa72bfb2eb7e33f0b) | 1071 | 1036 | 96.73% | | | Head commit (f164670c8ca9e3d38290e6b0302382d4d635ebcf) | 1071 (+0) | 1036 (+0) | 96.73% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#819) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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